linux-kernel - [PATCH 05/10] writeback: cleanup writeback_single

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Message-Id: <1253803236-20760-6-git-send-email-jens.axboe@oracle.com>
Date:	Thu, 24 Sep 2009 16:40:31 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	linux-kernel@...r.kernel.org
Cc:	fengguang.wu@...el.com, shaohua.li@...el.com,
	chris.mason@...cle.com, jack@...e.cz,
	Michael Rubin <mrubin@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Fengguang Wu <wfg@...l.ustc.edu.cn>,
	Jens Axboe <jens.axboe@...cle.com>
Subject: [PATCH 05/10] writeback: cleanup writeback_single_inode()

From: Wu Fengguang <fengguang.wu@...el.com>

Make the if-else straight in writeback_single_inode().
No behavior change.

Cc: Jan Kara <jack@...e.cz>
Cc: Michael Rubin <mrubin@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Fengguang Wu <wfg@...l.ustc.edu.cn>
Signed-off-by: Jens Axboe <jens.axboe@...cle.com>
---
 fs/fs-writeback.c |   15 +++++++--------
 1 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 551684d..916e834 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -449,8 +449,13 @@ writeback_single_inode(struct inode *inode, struct writeback_control *wbc)
 	spin_lock(&inode_lock);
 	inode->i_state &= ~I_SYNC;
 	if (!(inode->i_state & (I_FREEING | I_CLEAR))) {
-		if (!(inode->i_state & I_DIRTY) &&
-		    mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
+		if (inode->i_state & I_DIRTY) {
+			/*
+			 * Someone redirtied the inode while were writing back
+			 * the pages.
+			 */
+			redirty_tail(inode);
+		} else if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
 			/*
 			 * We didn't write back all the pages.  nfs_writepages()
 			 * sometimes bales out without doing anything. Redirty
@@ -494,12 +499,6 @@ writeback_single_inode(struct inode *inode, struct writeback_control *wbc)
 				inode->i_state |= I_DIRTY_PAGES;
 				redirty_tail(inode);
 			}
-		} else if (inode->i_state & I_DIRTY) {
-			/*
-			 * Someone redirtied the inode while were writing back
-			 * the pages.
-			 */
-			redirty_tail(inode);
 		} else if (atomic_read(&inode->i_count)) {
 			/*
 			 * The inode is clean, inuse
-- 
1.6.4.1.207.g68ea

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